1.查看当前版本

dotnet --version

C:\Users\18749>dotnet --version
7.0.306

2.查看所有版本信息

dotnet --info

C:\Users\18749>dotnet --info
.NET SDK:Version:   7.0.306Commit:    f500069cb7运行时环境:OS Name:     WindowsOS Version:  10.0.22621OS Platform: WindowsRID:         win10-x64Base Path:   C:\Program Files\dotnet\sdk\7.0.306\Host:Version:      7.0.9Architecture: x64Commit:       8e9a17b221.NET SDKs installed:6.0.412 [C:\Program Files\dotnet\sdk]7.0.306 [C:\Program Files\dotnet\sdk].NET runtimes installed:Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]Microsoft.AspNetCore.App 6.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]Microsoft.AspNetCore.App 7.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]Microsoft.NETCore.App 6.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]Microsoft.NETCore.App 7.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]Microsoft.WindowsDesktop.App 6.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]Microsoft.WindowsDesktop.App 7.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]Other architectures found:x86   [C:\Program Files (x86)\dotnet]registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]Environment variables:Not setglobal.json file:Not foundLearn more:https://aka.ms/dotnet/infoDownload .NET:https://aka.ms/dotnet/download

我们看到安装了两个版本，因此可以切换

.NET SDKs installed:
6.0.412 [C:\Program Files\dotnet\sdk]
7.0.306 [C:\Program Files\dotnet\sdk]

3.版本切换

dotnet new globaljson --sdk-version 版本号 --force

C:\Users\18749>dotnet new globaljson --sdk-version 6.0.412 --force
已成功创建模板“global.json file”。C:\Users\18749>dotnet --version
6.0.412

现在就切换好了！